#include"Sentence.h"
bool operator==( Sentence &lhs, Sentence &rhs){
    return lhs.contents == rhs.contents;
}
bool operator!=( Sentence &lhs, Sentence &rhs){
    return !(lhs.contents == rhs.contents);
}
bool operator<(Sentence &lhs, Sentence &rhs){
    return lhs.contents < rhs.contents;
}
bool operator>(Sentence &lhs, Sentence &rhs){
    return !(lhs < rhs);
}